The Salina Cruz refinery, damaged by fire and floods earlier this month, will be up and running again by July 30.
Fernando Zavala Lombardi now wears hats of cabinet chief and minister of economy and finance.
The energy ministry says consultations will be extended among indigenous communities in Chiapas prior to onshore oil and gas exploration and production.
Local firm Electroingeniería will build the pipeline in Córdoba province.
Natural gas and crude production fell 6% year-on-year in May.
The finance ministry has established the economic terms for the new contracts that the state oil firm will sign with partners chosen in the July 12 and October 4 auctions.